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Questions tagged [snubber]

A snubber is a circuit used to suppress transient voltages in electrical circuits. It can include RC snubbers that comprise a resistor and a capacitor in series, often used for AC circuits, and also a diode used across relays and other inductive components to suppress their inductive 'kickback'.

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Snubber for Relay Contact Switching Resistive Load

I am working on a redesign of some circuit boards and am looking for a way to save space and potentially switch to surface mount parts. Some of the largest through hole parts in use are for an RC ...
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Protecting malfunctions in relays which operate roller shutters (motor, inductive load)

I have a circuit used to control roller shutters in my home, which roughly can be seen in the schematic below. simulate this circuit – Schematic created using CircuitLab It works, but after ...
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How to connect snubber across the relay?

How can a snubber circuit be connected accross a relay. Because when we connect a snubber accross the relay then the capacitor always allows the current to flow through it. Relay I am using is a 12V ...
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Snubber maximum ratings

I'm developing a home automation system, and using a triac to power on/off some lights. My problem is that lights from other rooms when switched on/off are producing noise/spikes and flashing the ...
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40 views

Snubber capacitor VAC handling by frequency of C0G?

I'm looking for a suitable snubber capacitor (220 pf) for a boost converter. The semiconductor manufacturer recommends some ceramic capacitors for this http://www.mouser.com/ds/2/212/...
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373 views

How do you calculate RC snubber values for a discrete bridge rectifier

I'm working on a small linear power supply for an audio amplifier (home/hobby use) and I want to add an RC snubber on the rectifier diodes. I know this might be overkill, but I'm looking at it as an ...
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90 views

Operating a 24VAC solenoid with a Triac. Protecting with TVS DIODE, RC Snubber or both?

As part of a project I am controlling 24VAC solenoid sprinkler valves like this https://rayshobby.net/wordpress/understanding-24vac-sprinkler-valves/ using a triac (BT1308W) http://www.mouser.com/ds/2/...
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250 views

RC snubber placement

I would like to ask you about a problem that I have been experiencing recently. I am using a contactor to safely disconnect a hybrid motor starter. The starter is designed to, when tripped with its ...
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99 views

Questions on snubber circuit

I have this piece of circuitry that is supposed to protect a thyristor from spikes. Is not clear to me how it is working and if the values suggested are ok. The thyristor is a TIC106D The trigger ...
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1answer
46 views

pmp6712 active buck snubber operation

I need to design a clamp circuit in order to clamp the ringing voltage of a square wave. Therefore, I am planning to use the circuit given below. This circuit belongs to TI however, I couldn't get any ...
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32 views

Digital Counter signal oscillation

I've a digital counter (Kubler Codix 908) with integrated 30Hz interference input filter integrated, but sometimes (when the contact that will increment the counter is closed) it counts two pieces... ...
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149 views

Do ferrite beads need snubbing diodes?

Inductors, when applied as inline power filters, need a parallel snubbing diode so that when the load opens, the current can be safely discharged. In certain contexts, ferrite beads such as the Laird ...
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228 views

Zener snubber analysis

Lets imagine a Forward/Flyback converter with a zener snubber. How to analyse how this DZ snubber works? My problem is that how can I know what is the voltage of the common node of the two diodes? ...
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98 views

Snubber Network Over a Switch

I'm a newbie to electronics even though I have been working on them for a few years in mostly a hobbyist setting. I'm posting here for the first time so please be gentle. The problem I'm having with ...
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1answer
132 views

Designing flyback converter - DZ snubber

In many examples for DZ snubber zener voltage is calculated from maximum MOSFET rating and some arbitrary choosen voltage leakage (usually a percentage of Vin). They don't even use leakage inductance (...
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963 views

Is this snubber needed for MOSFET?

I met this kind of snubber network in Switchmode Power Supply Handbook (by Keith Billings and Taylor Morey): They were using it with BJTs, and the reason was to limit dv/dt to avoid secondary ...
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Different snubber/clamp designs used together on SMPS'

I have seen many types of snubber/clamp designs and my question is that is it reasonable to use them together or its an overkill? So let's see an example: Here is a Flyback converter with RCD clamp (...
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Snubber on the line or just the inductor

A document on the public internet, yet apparently covered by NDA, makes a surprising claim about snubbers. vendor link or archive.org Page 12 shows a device powering and switching an inductive DC ...
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60 views

RC snubber on Mosfet (smps) max C

I am designing a SMPS from TI http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf We replaced the Mosfet fro schematic with STL11N65M5 that has a Coss of 18pf So I am designing a RC snubber across it and I ...
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88 views

Electromechanical or Solid State Relay Low Duty Cycle 1/2 HP Motor

i'm hoping someone can help me decide the best relay (in my scenario) for controlling a 1/2hp inductive load from 110-120v motor. I've spent numerous days researching this and hoping someone with more ...
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1answer
222 views

Problems snubbing HF noise on flyback converter transistor

I am working on the design of a flyback converter based on the LT3751 capacitor charging circuit. My design is similar to the 42 A cap charger example on pg. 25 of the LT3751 datasheet. In my case, ...
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70 views

Thermal regulator on DS18B20 and ATtiny2313A

I'm working on a thermal regulator for a greenhouse. My device will use ATtiny2313A as uC and DS18B20 as thermal sensor. I also use 1602 LCD display to monitor current temperature and set low and high ...
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Design and simulation of snubber and hysteresis current control

I want to do an hysteresis current control with this circuit: that have three operation modes: in order to make the output current to follow a triangle wave as reference. I made a simple C code to ...
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1k views

Selecting Flyback Diode for Inductive Load

I intend to run a 48V DC water pump which uses this motor (http://www.leeson.com/leeson/searchproduct.do?invoke=viewProductDetails&motorNo=098382.00&productType=0) through a solid-state relay ...
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1answer
273 views

RC snubber across mosfet or diode with ferrite bead [closed]

I already designed a RC snubber across a mosfet and diode successfully . Reading through some whitepapers , I have seen the addition of a ferrite bead in series with RC snubber. Do you recommend it ...
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Calculate RC snubber for 240v ac coil relay

In a project I use several 12v dc coil electromechanical relays. I use diodes in parallel to the coil protect them from flyback. I also have one relay with an 240v ac coil. I have learned that I ...
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Voltage Spikes in MOSFET H Bridge

As a part of my effort to build a pure sine inverter I made the following MOSFET H Bridge. This was connected to a load through a LC filter where PWM signals are given as in the diagram below.PWM ...
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267 views

RC snubber on mains connected bridge rectifier

I am designing a SMPS (90-230V) that has a bridge rectifier connected to the mains (of course after x2 capacitor and common mode choke). We need this SMPS not to pollute with noise the mains , so we ...
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1k views

Is a snubber for transformer primary winding necessary?

When there is a inductor in the circuit and is being switched on and off it is necessary to put diode across that inductor to prevent high voltage overshoots. simulate this circuit – Schematic ...
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400 views

Snubber Capacitor Voltage Rating in the Real World

What are voltage ratings for the capacitors inside the common off the shelf ac snubber networks, such as 0.1uF + 100 Ohm ? It would seem that larger inductive loads can easily drive the capacitor ...
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68 views

IXYS Solid State Relay Datasheet question (Snubber Diode Required?)

Here is the datasheet that I have a question about. http://www.ixysic.com/home/pdfs.nsf/www/CPC1907B.pdf/$file/CPC1907B.pdf It states in the Features List on first page. "Arc-Free With No Snubbing ...
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106 views

How should I change the R and C values in a snubber circuit when I change motors?

I am using a triac circuit to convert a 3 speed motor into a fully variable speed motor. The triac circuit I’m using is one I lifted from another motor which is already a fully variable speed motor. ...
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678 views

Overshoot on MOSFET drain

What can i do to minimize overshoot and undershoot when MOSFET switches on and off? (waveform taken using short ground spring probe, PCB is 2-layer) The rise and fall times should be less than 150ns. ...
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1k views

Flyback Transformer — RC Snubber vs. TVS Diode?

I've got a flyback transformer circuit, that was designed by a firm and they tended to over-engineer things (this is in a commercial project). I re-laid out their circuit and on the primary end of ...
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788 views

Formula of snubber capacitor capacitance for SCR dv/dt protection

I have a formula here for finding the suitable value of shunt capacitance to be put on an SCR snubber. \$C=\frac{1}{2L}(\frac{0.546V}{dv/dt})^2\$ where L is the snubber inductor, V is the DC supply ...
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Snubber diodes for a DC Motor with 2 relays

simulate this circuit – Schematic created using CircuitLab Description: RLY1 relay switches 12v on or off. RLY2 changes direction of current flow to the motor. I have flyback diodes on RLY1 &...
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188 views

Getting output voltage after connecting snubber across Triac

i am controlling Ceiling fan through Panasonic AQH2332A SSR, but getting voltage across fan terminals even if SSR off. The voltage across terminals is about 35v. i tried to reduce snubber capacitor ...
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735 views

Snubber circuit

The circuit is a Single phase motor(120V runs 4.7amps running amps), and a relay to trigger the motor on/off. I'm looking to use a snubber circuit to protect the relay contacts for prolonged use. ...
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1answer
1k views

Voltage spike in MOSFET circuit

I am using two MOSFETs (IXFB210N30P3) at about 100kHz (with different duty cycles) to split current from a 100V rectifier into three separate coils. This is a very rough schematic of (one branch of) ...
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1answer
695 views

Voltage spikes in MOSFET circuit

I am using two MOSFETs (IXFB210N30P3) at about 100kHz (with different duty cycles) to split current from a 100-200V rectifier into three separate coils. This is a very rough schematic of (one branch ...
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192 views

Zero Cross TRIAC circuit for regulator fails on voltage spike

I am using a ZC TRIAC circuit to switch and regulate an electric appliance e.g. a table fan, a electric drill etc. I must confirm that proper SNUBBER circuit is used and everything works fine. I ...
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1answer
230 views

MOV as a snubber

I'm trying to design a solid state circuit breaker using bi-directional switch modules with IGBTs. (Rating: 3phase: 690V AC, 1000A) The problem here would be the transient voltage spikes across the ...
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1answer
1k views

Snubber circuit for 3 phase inverter designed for BLDC motor

I'm designing a motor controller for 3-phase BLDC motor. I'm using following components, Gate driver - IR2184 MOSFET - IRF540N The complete circuitry and output waveforms are available here. I have ...
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3answers
510 views

Relay failure with inductive loads: arcing vs. surges

What is the primary cause of premature relay failure with AC inductive loads: inductive kickback causing arcing across the contacts or the inrush surge current exceeding the capacity of the contacts? ...
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438 views

Type of Capacitor for snubber application (Ceramic vs Film)

I need to choose the capacitor for a snubber on a Flyback converter. I have calculated the value, but I have a doubt on what type of capacitor(ceramic or film) is suitable for this application. Are ...
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How to calculate snubber value for triac

I want to use an optocoupler and triac to control a ceiling fan. How do I calculate the snubber resistor and capacitor value? Will the inductive load of the fan change my snubber value?
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Voltage-boosted switching boost converter

I refer to my previous question which may be found here. With the LT1172 the highest output voltage of the booster is about 60 V, or slightly more. Now I need more, say 100 V. Linear technologies' ...
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1answer
404 views

Should I use both a MOV & a flyback diode for a very high power DC motor (7560W)?

I couldn't find a circuit online that uses both so I figured I better ask those who know more than I do if this would be a mistake or not. Thanks for your help
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53 views

snubber networks confusion

In "switching power supply handbook" by Keith Billings P2 is supposed to represent leakage inductance and D3 is a catch diode, but i don't get quite right. What is that diode for? how is it even ...
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919 views

Snubber Circuit Suggestion

I am seeking some feedback in improving the reed switch snubber protection circuit shown below. The switch will drive a coil of an AC relay. Please note that the AC relay coil is not accessible. Any ...